Metadata: Identification_Information: Citation: Citation_Information: Originator: Noreen A. Buster Originator: Owen T. Brenner Originator: James G. Flocks Publication_Date: 20171121 Title: Snap Raster used to create interpolated digital elevation models (DEMs) in the nearshore around Ship, Horn, and Petit Bois Islands, Mississippi: 1916 to 1920, 2008 to 2009 and 2016 Geospatial_Data_Presentation_Form: raster digital data Series_Information: Series_Name: U.S. Geological Survey Data Release Issue_Identification: doi:10.5066/F7028QFV Publication_Information: Publication_Place: St. Petersburg, FL Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/F7028QFV Description: Abstract: To characterize coastal change, historical maps and complementary records were compiled including: topographic sheets (T-sheets), hydrographic sheets (H-sheets, smooth sheets), shorelines, and bathymetric soundings surrounding the Mississippi (MS) barrier islands over several time periods (1916-1920, 2008-2009 and 2016). One goal of this work was to create a time-series of bathymetric change maps around the islands. This USGS data release includes three digital elevation models (DEMs) for 1916 to 1920, 2008 to 2009, and 2016; however, this metadata file pertains to the snap raster (MS2016_snapraster_50m.tif) used to define pixel locations during raster DEM creation. This work was completed in cooperation with the United States Army Corps of Engineers (Mobile, Alabama) and the National Park Service as part of the Mississippi Coastal Improvements Program (MsCIP). Purpose: The purpose of this effort was to create bathymetric grids and bathymetric change maps around the MS barrier islands to broadly characterize subaqueous morphologic change both spatially and temporally. Supplemental_Information: This blank raster file was created prior to building the 1916 to 1920, 2008 to 2009 and 2016 bathymetric DEMs (contained within this data release) and ensures consistent pixel location for the three DEMs, allowing for direct DEM comparison during subsequent bathy change assessments. After creating a bounding polygon shapefile, the snap raster was created within ArcGIS 10.4.1 using the 'Polygon to Raster' tool and has a cell size of 50 meters. Individual cell values were all set to 0, and are entirely arbitrary and irrelevant. The spatial reference system of the snap raster is Universal Transverse Mercator (UTM) North American Datum of 1983 (NAD83) and North American Vertical Datum of 1988 (NAVD88) GEOID12B. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2017 Currentness_Reference: used for DEM formatting Status: Progress: complete Maintenance_and_Update_Frequency: None Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -89.323816 East_Bounding_Coordinate: -87.997403 North_Bounding_Coordinate: 30.491615 South_Bounding_Coordinate: 30.105059 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: elevation Theme_Keyword: location Theme_Keyword: geoscientificInformation Theme_Keyword: imageryBaseMapsEarthCover Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: marine geology Theme_Keyword: geophysics Theme_Keyword: bathymetry Theme_Keyword: digital elevation models Theme_Keyword: ocean characteristics Theme_Keyword: ocean processes Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: hydrography Theme_Keyword: geophysical Theme_Keyword: seafloor mapping Theme_Keyword: historical Theme_Keyword: NOAA Theme_Keyword: National Oceanic and Atmospheric Administration Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: St. Petersburg Coastal and Marine Science Center Theme_Keyword: SPCMSC Theme_Keyword: coastal location Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Mississippi Place_Keyword: Alabama Place_Keyword: Ship Island Place_Keyword: Horn Island Place_Keyword: Petit Bois Island Place_Keyword: Dauphin Island Place_Keyword: Mississippi Sound Stratum: Stratum_Keyword_Thesaurus: Oregon Geospatial Enterprise Office (GEO) Stratum Keyword Stratum_Keyword: sea surface Stratum_Keyword: epipelagic Access_Constraints: None Use_Constraints: Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Noreen A. Buster Contact_Organization: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: nbuster@usgs.gov Data_Set_Credit: U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center Native_Data_Set_Environment: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.4.1 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The accuracy of this file is unknown and inconsequential. It was solely created to maintain consistency in pixel location between the three raster DEMs contained within this data release. Logical_Consistency_Report: This snap raster file was applied during interpolation of the DEMs within this data release (1916_1920_MS_NAD83NAVD88g12B_50m.tif, 2008_2009_MS_NAD83NAVD88g12B_50m.tif, and 2016_MS_NAD83NAVD88g12B_50m.tif) to ensure consistent pixel location, allowing for direct DEM comparison during subsequent bathy change assessments. Completeness_Report: complete Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: No formal positional accuracy tests were conducted. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: No formal positional accuracy tests were conducted. Lineage: Process_Step: Process_Description: This blank raster file was created prior to building the 1916 to 1920, 2008 to 2009 and 2016 bathymetric DEMs (contained within this data release) using Esri ArcGIS 10.4.1. First a new polygon shapefile, with a larger spatial coverage than the 1916-1920, 2008-2009, and 2016 XYZ datasets, was created using larger than all XYZ data cover was created. Using the 'Polygon to Raster' tool, the snap raster was created with a cell size of 50 m. All raster cell values were set to 0, and are entirely arbitrary and irrelevant. Process_Date: 201707 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Noreen A. Buster Contact_Organization: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center Contact_Position: Geologist Contact_Address: Address_Type: mailing Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: nbuster@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 820 Column_Count: 2540 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 16 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -87.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 50 Ordinate_Resolution: 50 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222101 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum 1988 GEOID12B Altitude_Resolution: 0.0001 Altitude_Distance_Units: meters Altitude_Encoding_Method: Attribute values Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Noreen A. Buster Contact_Organization: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: nbuster@usgs.gov Resource_Description: MS2016_snapraster_50m.tif Distribution_Liability: Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: GeoTIFF File_Decompression_Technique: ZIP Transfer_Size: 0.38 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-F7028QFV/data/MS2016_snapraster_50m.zip Fees: None Metadata_Reference_Information: Metadata_Date: 20190319 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Noreen A. Buster Contact_Organization: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: nbuster@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Security_Information: Metadata_Security_Classification_System: none Metadata_Security_Classification: unclassified Metadata_Security_Handling_Description: none